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GMATprep Practice Test Question- Help [#permalink] New post 24 Apr 2006, 10:51
There was a question as follows:

Which of the following is closest to:

2^5 + 2^5 + 3^5 + 3^5 + 3^5

The answer is 2^7 + 3^8.

Is there a faster way to do these type of problems (rather than do the actual calculation)?

Thanks
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 [#permalink] New post 24 Apr 2006, 11:28
What were the other answer choices? The question and the solution
you give are so much apart (793 vs. 6689) that it depends on the
other choices whether there is a quicker way.
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Re: GMATprep Practice Test Question- Help [#permalink] New post 24 Apr 2006, 11:44
CfaMiami wrote:
There was a question as follows:

Which of the following is closest to:

2^5 + 2^5 + 3^5 + 3^5 + 3^5

The answer is 2^7 + 3^8.

Is there a faster way to do these type of problems (rather than do the actual calculation)?

Thanks


What about factorization?

2*(2^5) + 3*(3^5)

= 2^6 + 3^6

but yeah we would need to check the other options
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 [#permalink] New post 25 Apr 2006, 04:45
Sorry, the other choices are

5^6

13^5

2^6 + 3^6

4^5 + 9^5

it's on practice test one of the gmatprep software
  [#permalink] 25 Apr 2006, 04:45
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